Excavator



P. W. HILL.

EXCAVATOR.

APPLICATION FILED AUG. 6, 1919.

Patented May 9, 1922.

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[nven $02 P. W. HILL.

EXCAVATOR. APPLICATION FILED AUG 6. 1919. 1,415,561, Patented May 9, 1922.

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' EXCAVATOR.

Specification of Letters Patent. I

Patented May 9, "1922.

Appliea'tion filed August 6, 1919. Seria1No."315,667.

To all whom it may concern:

Be it known that: I, PETER lV. HILL, a

citizen of the United States, residing at Dorchester, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements-in EX- cav'ators; and I do hereby/declare the following to be a full, clear, and "exact description of the invention, such as will enable othersskilled inthe art towhich it appertains to make and 'usethe same.

- The present invention relates to excavators of the type, particularly, comprising a movable base i 01' platform which supports a boom for guiding the handle of an excavating shovel or dipper.

Excavators of this type are usuallyconstructed and arranged in such'manner that the dipper excavates in a direction away from the platform and, consequently, :the platform of an excavator acting in;this manner must travel over the trench or channel being out which, of course, is objectionable in many cases. I

' One ofthe objects of the present invention is to provide a novel and improved excavator intwhich the dipper is capable of being actuatedto excavate either toward or from the platform.

The features of the present invention comprise certain constructions, arrange ments and combinations of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art.

The several features of the present invention will be clearly understood from the following description and accompanying drawings in which:

Figure 1 is a side elevation, partly broken away to save space, of an excavator embodying the features of the invention in their preferred form; Fig. 2 is a plan view of the upper forward part of the excavator; and Fig. 3 is a view corresponding to F ig. 1, but with the excavator adjusted so that the dipper excavates in a direction away from the platform instead of toward the platform as shown in Fig. 1.

The excavator as illustrated in the drawings is provided with a platform 4 which is adapted to be -moved longitudinally by being mounted on a pair of trucks 6 located near its forward end, and a pair of trucks (not shown) located at its rear end. On the forward end of the platform 4 1s supported a block 8 inwhich is journaled thelower end ofan upright mast 10. The upper end of the mast 10 is provided with a gudgeon pm 12 which journaled in a spider 14 projecting from the upper end of a frame 16 secured to the platform4. The mastlO is adapted to be rotated through: a bull wheel 18 secured to the lower end thereof which is connected to a w-indlassdrum of an engine .(not shown) carried by the platform by meansfof a "cable 20. A bracket 22 is'removably secured by bolts 24-to the mast 10 and on a pin 26 secured to the bracket is pivotally mounted the inner end of a boom28 Theouter end of theboom 28 is supported by means of a pair of guy ropes 30, having I their outer ends secured to the projecting ends of a pin 31 extending transversely through the outer end'o-f the boom and their inner ends secured to a plate 32 which prov ded with an aperture fittingover the gudgeon'pin 12; The boom 28 comprises a pair of parallelb'ars 34 which are separated to provide a space'between them" by means of blocks "36 secured betweenithe ends thereof. Near the "ends of the boom 28 between theba'rs -84aremounted guide rollsf38. The

handle 42 of an excavating dipp'er'44 extends mounted on the mast 10, down through an axial aperture 52 in the mast, andthence over a guide pulley 54 to a drum of the ex cavator englne. -A second cable 56 leads 49 and then over the guide pulleys 50 and 54 to an engine drum. When the excavator is set up so that the mouth of the excavating dipper 'is directed toward the platform (as shown in Fig. l) the dipper handle is guided from the dipper 44 over the pulley block by the outer one of the guide rolls 88. To operate the dipper, itis first raised to its outer uppermost position as sh ownby dotted lines in Fig. 1, by means of the cables 46 and 56 and is then allowed to drop by gravity so that its mouth will dig into the ground or the material to be excavated in the'usual manner, the dipper being controlled during this movement by means of the cables 46 and 56. The dipper is then raised by means of'theicables 46 and 56 towardthe platform to substantially the position shown by dotted lines at the right in Fig. 1 and the mast is swung to one side or the other of the platform to position the dipper above a car or truck, whereupon the usual bottom 58 of the dipper is swung open to permit the dipper full of material to be discharged therefrom. The mast may then be swung to reposition the dipper directlyabove the material to be excavated and to its initial outer uppermost position ready to be dropped by gravity to repeat the excavating operation.

To set the machine to excavate away from the platform (as shown in Fig. 3) the bracket 22 is adjustable downwardly to cause the boom to be inclined outwardly and upwardly, bolt holes 60 being provided in the mast for this purpose. The dipper handle is removed from the boom and is re inserted between the bars of the boom in reverse position so that the mouth of the dipper will be directed away from the platform of the excavator, the ends of the cables 4:6 and 56 being reconnected to the dipper. The operation of the dipper when the ma chine is thus set is substantially the same as that described when the mouth of the dipper is directed toward the platform. In this case, however, the handle of the dipper is guided by the inner guide roll 38. In order to prevent the end of the dipper handle from striking the mast and adjacent parts of the excavator during the operation thereof, a guard board 62 is pivoted at its lower end and its upper end rests against the outer end of the plate 32 on the upper side of the boom.

. The guy ropes 30 are spaced sufiiciently apart to permit the dipper handleto move between them and this arrangement of the guy ropes provides a central support for the outer end of the boom.

Nhile it is preferred to employ the specific construction and arrangement of parts illustrated and described, it is to be understood that this construction and arrangement is not essential except so far as specified in the appended claims.

The nature and scope of the present invention having been indicated, and an excavator embodying the several features of the present invention in their preferred form having been specifically described, what is claimed is:

1. An excavator having, in combination, a mast, a boom supported by the mast and provided with an elongated guideway extending longitudinally thereof, an excavator dipper, adipper handle extending through the guideway and working freely by gravity from end to end thereof during the operation of the dipper, and means for operating the dipper.

2. An excavator having, in combination, a mast, a boom arranged substantially horizontal supported by the mast and provided with an elongated guideway extending longitudinally thereof, an excavator dipper, a dipper handle extending through the guideway and working freely by gravity from end to end thereof during the operation of the dipper, and means for operating the dipper to excavate toward the mast.

PETER W. HILL. 

